Mega

Mega is equal to Circle(2) or ② in circle notation or Pentagon(2) in Steinhaus-Moser notation.[1] It was defined by Hugo Steinhaus along with the megiston in the book Mathematical Snapshots. Mega can also be defined recursively as \(m_{256}\) in the sequence defined by \(m_0 = 256\) and \(m_{n + 1} = m_n^{m_n}\).